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Mecinus janthinus
Biological agent type
stem weevil.
Plant species attacked
dalmatian toadflax (Linaria dalmatica)
yellow toadflax (Linaria vulgaris)
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Mecinus janthinus adult
Mecinus janthinus larvae
Images by Eric Coombs, Oregon Department of Agriculture.
Foreground-damage by weevil causing stand reduction
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Site of attack
Leaves and stems.
Mode of attack
Larvae are stem miners, adults can cause damage to flowers and young leaves.
Destructive stage
Larval and adult.
Collection and release information
Limited in distribution at nursery sites at this time. Consult with ODA for availability for your area.
History in Oregon
The stem boring weevil Mecinus janthinus was introduced into seven counties in 2001. The weevil has been recovered in several of those counties. This is a promising agent as stand reductions have already been observed at several sites in Oregon. Several nursery populations in Oregon became collectible in 2004.
Release status in Oregon
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distribution map